FIG. 3.

Conservation of the hrpR promoter and coding sequence. Sequences were aligned using the CLUSTAL W version 1.8 program (61) and data from GenBank accession numbers AF2322004, U03853, U03852, X77638, and AF069650. (A) Proposed HrpR-responsive hrpS promoter element. The dashed lines represent the HrpR box proposed by Grimm et al. (15). (B) Postulated ς⁵⁴-dependent hrpS promoter element. Conserved promoter elements (+) and the transcriptional initiation site (^) identified by Grimm et al. (15) are shown. (C) hrpRS intergenic region. The deduced ribosome binding site for hrpS is indicated by the ∼ symbols.